EP0484831A1 - Bandage pneumatique pour bicyclette - Google Patents

Bandage pneumatique pour bicyclette Download PDF

Info

Publication number
EP0484831A1
EP0484831A1 EP91118649A EP91118649A EP0484831A1 EP 0484831 A1 EP0484831 A1 EP 0484831A1 EP 91118649 A EP91118649 A EP 91118649A EP 91118649 A EP91118649 A EP 91118649A EP 0484831 A1 EP0484831 A1 EP 0484831A1
Authority
EP
European Patent Office
Prior art keywords
layers
breaker
pneumatic tire
carcass
tire according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP91118649A
Other languages
German (de)
English (en)
Other versions
EP0484831B1 (fr
Inventor
Rüdiger Schulte
Gert Detzner
Rolf Mahling
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental AG
Original Assignee
Continental AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE4135838A external-priority patent/DE4135838A1/de
Application filed by Continental AG filed Critical Continental AG
Priority to AT91118649T priority Critical patent/ATE85271T1/de
Publication of EP0484831A1 publication Critical patent/EP0484831A1/fr
Application granted granted Critical
Publication of EP0484831B1 publication Critical patent/EP0484831B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/0009—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion
    • B60C15/0036—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion with high ply turn-up, i.e. folded around the bead core and terminating radially above the point of maximum section width
    • B60C15/0045—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion with high ply turn-up, i.e. folded around the bead core and terminating radially above the point of maximum section width with ply turn-up up to the belt edges, i.e. folded around the bead core and extending to the belt edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/02—Carcasses
    • B60C9/04—Carcasses the reinforcing cords of each carcass ply arranged in a substantially parallel relationship
    • B60C9/06—Carcasses the reinforcing cords of each carcass ply arranged in a substantially parallel relationship the cords extend diagonally from bead to bead and run in opposite directions in each successive carcass ply, i.e. bias angle ply
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C2200/00—Tyres specially adapted for particular applications
    • B60C2200/12—Tyres specially adapted for particular applications for bicycles

Definitions

  • the invention relates to a pneumatic tire for bicycles, which has a diagonal carcass anchored to two bead cores.
  • a motorcycle tire is known from Japanese patent application 59-118 506, the carcass of which is built up from only two layers, the first of which wraps around the bead cores with long folds, which are folded back into the tread area and overlap there, while the second only the bead cores with short bends, so that the tire has four carcass layers in the tread area, three carcass layers in the side walls and four carcass layers in the contact surface to the rim flange.
  • the tread width of this tire is 1.15 times the height of the tire, which is measured from the radially innermost circumference of the bead toe to the zenith.
  • the application dates from a time (1984) when the suspension of both wheels of a motorcycle was taken for granted and with a tire height between 70 and 85 mm an operating air pressure of about 2.5 to 3.0 bar was provided without the tire reaching Rim flange pierced.
  • a passenger car diagonal tire is known from German utility model 1 684 696, in which one or more additional fabric layers are arranged between two carcass plies in the area of the tread. As shown in FIG. 1, the tread width is 0.6 times and the tire width overall is 0.86 times the tire height.
  • the invention is based on the problem that previously particularly low rolling resistance on bicycles could only be achieved by keeping the tire cross-sections small. At the expense of deteriorating tire suspension, the walk of the side walls could be kept small. Due to the diagonal carcass structure, the ratio between tire width and height was previously close to 1, and more precisely 1, the higher the operating air pressure. A deviation of up to 0.15 on both sides was only possible at pressures below 3 bar. Accordingly, low-resistance bicycle tires had to have very narrow treads. Such tires are known from racing bicycles. These tires require well paved roads.
  • the coarseness of the MTB tires in a mitigated form is combined with narrow tire cross-sections.
  • the ATB tires actually have a lower rolling resistance than the MTB tires (and a higher one than road racing tires) on paved roads, they are inferior to the MTB tires (and superior to road racing tires) on soft surfaces.
  • the object of the invention is to provide bicycle tires that combine low rolling resistance and low susceptibility to puncture with one another, with favorable driving behavior, even on soft surfaces.
  • the object is achieved in that at an operating air pressure of at least 3.5 bar, the width of the tire is at least 1.2 times the height of the tire and that the thread density or number of layers in the zenith is at least 30% greater than in the side walls.
  • the invention is based on the finding that increasing the tire width contributes less to increasing the rolling resistance on paved slopes than increasing the tire height. This has so far not been noticed because the height and width of diagonal tires were linked to each other.
  • Tires according to the invention preferably have approximately the overall height of the current ATB tires and a tread design and width similar to the MTB tires.
  • Tire dimensions according to the invention are: 54 / 70-559, 47 / 80-559, 47 / 80-622 and 37 / 80-622, the first number being the tire width (without writing) in mm, the second being the ratio of tire height to tire width in % and the third indicates the rim diameter in mm.
  • the first three dimensions are advantageously operated with an air pressure of 3.5 bar, the latter with 4.0 bar.
  • steel belted tires are of a fundamentally similar construction to car tires, because they would have to be too expensive due to the processing difficulties of the very thin steel wires required in the bicycle sector and because of the small number of pieces, and because of their radial carcass it takes some getting used to when transferring lateral forces.
  • the operating air pressure which is unusually high in relation to the tire width, prevents the tire from striking down to the rim flanges. A strong constriction in the zenith area is necessary in order to achieve the desired low cross-section despite the high air pressure.
  • Bicycle tires according to the invention thus achieve a very low susceptibility to punctures. This enables the tubeless design of bicycle tires for the first time.
  • the associated reduction in rolling resistance brings the universally applicable bead strips according to the invention in terms of their rolling resistance into proximity to the sewn tubular tires of road racing.
  • the building drum which is essentially cylindrical, is not shown in the sequence of figures 1 to 5. All figures represent a cross section through the resulting green tire. For the sake of clarity, only what is carried out on the top of the building drum is shown; Of course, the method steps shown also extend to all other circumferential locations of the resulting green tire, that is to say also to the lower side of the building drum, which is not shown here.
  • tissue layers are shown only as a line in FIGS. 1 to 6, 8 and 11.
  • the rubber layers adhering to and in the fabric layers are also not shown for the sake of clarity.
  • the edges of the carcass plies located beyond the gallows loops 6, 8 are referred to as folds and, in the context of this application, are generally provided with the reference number 12, it being possible to express by means of the addition of a further number after a point to which gallows loop the respective fold is connected.
  • the gallows loop 6 of the second carcass ply 5 adjoins the rump 12.6 and so on.
  • the Umbuck 12.6 is so long that it protrudes beyond the middle between the two bead cores 2 and 3. Meanwhile, the Umbuck 12.8 is short.
  • FIG. 4 analogously to FIG. 3, the two left edges of the two carcass plies 4 and 5 are wrapped around the left bead core 2.
  • the second carcass ply forms the gallows loop 7 on its left side and the first carcass ply the gallows loop 9.
  • the carcass bump 12.7 is so long that it projects beyond the middle between the two bead cores 2 and 3 and overlaps the carcass bump 12.6.
  • the green tire is then cambered in a known manner into the raised shape shown in FIG. 5.
  • There are four fabric layers in the tire zen namely the ends of the folds 12.6 and 12.7, which act as "breaker" strips 10, 13, the bottom layer of the second layer 5, and finally the first layer 4, which are located on the inside, and there are only four in the side walls three layers of fabric present.
  • FIG. 6 a thin side rubber layer 15 and 16 is applied to the intermediate product according to FIG. 5 at the zenith of the tread 14 and on each side wall.
  • the blank 1 is now ready for vulcanization.
  • FIG. 7 shows the tire vulcanized therefrom in a partially cut top view, that is to say in a top view in which so much has been cut away from layers lying further up that the thread course of the cord fabric layers which follow one another from the outside in is recognizable.
  • the outer "breaker” strip 13 which is formed from the end of the long carcass bump 12.7
  • the inner “breaker” strip 10 which is formed from the end of the long carcass bump 12.6, can be seen. Because of this construction, the thread course of both breaker layers is the same.
  • the next carcass layer underneath, which is formed in one piece from the same ply 5 as the "breaker” strips, has the same amount but the reverse direction of thread.
  • the first, the short carcass ply 4 in terms of amount and direction, has the same thread angle as the second, the long carcass ply 5.
  • a certain asymmetry in the deformation behavior of the tire sidewalls is accepted with this construction.
  • the fabric structure only has a total of four cut edges and that both the two inner carcass layers and the two breakers can lie one inside the other due to the thread direction being the same in terms of amount and orientation.
  • This construction also has the advantage that the carcass folds 12.8 and 12.9 offer protection against wear from the rim flange without the addition of additional strips. This risk would be great in the case of low-profile tires according to the invention without additional reinforcement in the absence of suspension suspension on bicycles, because the shortened side wall suffers greater deformations (stretching, compression, bending) with certain deflection.
  • FIG. 8 shows in cross-section a pneumatic bicycle tire according to the invention with a breaker package 11 arranged between the two carcass plies 4 and 5, which consists of an inner breaker strip 10 and an outer breaker strip 13.
  • the breaker strips are cut and laid on separately, so they are not connected to any bends. With this solution, too, the breaker strips serve to achieve a low-profile contour.
  • Both carcass plies are wrapped around the bead cores 2, 3 with short folds 12 and form (gallows loops) 6 to 9.
  • the short folds in conjunction with the low-profile contour have the advantage that they offer protection against wear from the rim flanges without the costly application of additional reinforcement strips.
  • This tire is equipped with a particularly gas-tight inner core 17, preferably made of butyl rubber, and can therefore be fitted or driven without a hose. This simplifies assembly and reduces rolling resistance.
  • the blank 1 is equipped with a tread 14 and side wall rubbers 15 and 16.
  • the cross section according to FIG. 8 relates both to designs with breakers, the threads of which run approximately in the circumferential direction, as a result of which a particularly effective constriction is achieved, which enables particularly small tire heights in relation to the width, and to those designs where the breaker threads are oriented in the same direction with the threads of the carcass plies 4, 5 wound around the bead cores 2, 3.
  • FIGS. 9 and 10 show different tires according to the cross section from FIG. 8 in a partially cut top view, as a result of which the thread angles are visible.
  • the outer that is to say the second carcass ply 5 was cut away in the upper 3 ⁇ 4 of the image area, so that the first carcass ply 4, which can also be seen at the edge of the image, appears again below.
  • the inner breaker strip 10 is located in the zenith area on the first carcass ply 4, the cut edges 18 of which are shown in thick solid lines.
  • the outer breaker strip 13 is located above it.
  • the threads of the outer breaker 13 and the adjacent second carcass ply 5, on the one hand, and the threads of the inner breaker 10 and the first, the inner carcass ply 4, on the other hand, are of the same size and orientation.
  • the effect of vulcanization here is that the breaker strips penetrate into the adjacent carcass ply, which enables a particularly low use of rubber in the zenith.
  • each of the pairs of layers mentioned looks almost like a single layer, but with a doubled thread density in the zenith.
  • the increased thread density in the zenith looks like a belt and enables the formation of a bicycle tire with a low cross-section.
  • FIG. 10 shows another variant of a tire with a cross-sectional structure according to FIG. 8 in a representation analogous to FIG. 9; here the two breaker layers 10, 13 have substantially more acute angles to the circumferential direction, namely 10 °. Due to this steep position, it is not possible for adjacent layers to penetrate into each other, but a particularly high constriction and thus a particularly small tire cross section is made possible.
  • FIG. 11 shows, in a manner analogous to that of FIG. 8, a tire whose breaker package 11 consists of only a single layer.
  • the threads of the breaker 11 - as can be seen in FIG. 12, a partially sectioned top view analogous to FIG. 9 - are placed approximately in the circumferential direction. This alignment is advantageously achieved with a method according to claim 6.
  • the invention enables low-profile tires in the existing budget for bicycles and thereby relaxes the target competition between low rolling resistance on paved paths on the one hand and unpaved paths on the other.
  • Tires according to the invention are intended for equipping ATBs (all-terrain bikes) and enable a compromise at a higher level between the extreme MTB (mountain bike) and road racing bike.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
EP91118649A 1990-11-03 1991-10-31 Bandage pneumatique pour bicyclette Expired - Lifetime EP0484831B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT91118649T ATE85271T1 (de) 1990-11-03 1991-10-31 Luftreifen fuer fahrraeder.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4034986 1990-11-03
DE4034986 1990-11-03
DE4135838A DE4135838A1 (de) 1991-10-30 1991-10-30 Luftreifen fuer fahrraeder
DE4135838 1991-10-30

Publications (2)

Publication Number Publication Date
EP0484831A1 true EP0484831A1 (fr) 1992-05-13
EP0484831B1 EP0484831B1 (fr) 1993-02-03

Family

ID=25898219

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91118649A Expired - Lifetime EP0484831B1 (fr) 1990-11-03 1991-10-31 Bandage pneumatique pour bicyclette

Country Status (3)

Country Link
EP (1) EP0484831B1 (fr)
DE (1) DE59100036D1 (fr)
ES (1) ES2038527T3 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0635383A1 (fr) * 1993-07-19 1995-01-25 Bridgestone Corporation Bandage pneumatique
EP0692394A3 (fr) * 1994-07-15 1996-04-03 Michelin Rech Tech Bandage pneumatique à carcasse diagonale comprenant une amélioration dans le renfort de sommet
EP1006008A1 (fr) * 1998-11-30 2000-06-07 The Yokohama Rubber Co., Ltd. Bandage pneumatique radial
EP2159076A1 (fr) * 2008-08-29 2010-03-03 The Goodyear Tire & Rubber Company Pneu à plis modulaires avec chevauchement de plis
EP3575109A1 (fr) * 2018-05-29 2019-12-04 Specialized Bicycle Components, Inc. Pneu de bicyclette a carcasse a deux couches
US11077712B2 (en) 2015-10-30 2021-08-03 Pirelli Tyre S.P.A. Tyre for bicycle wheels
WO2022171226A1 (fr) * 2021-02-12 2022-08-18 Continental Reifen Deutschland Gmbh Pneumatique pour deux-roues

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1554424A (fr) 1967-02-17 1969-01-17
LU68338A1 (fr) * 1972-09-01 1973-11-12
JPS59118506A (ja) 1982-12-24 1984-07-09 Sumitomo Rubber Ind Ltd 自動二輪車用タイヤ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1554424A (fr) 1967-02-17 1969-01-17
LU68338A1 (fr) * 1972-09-01 1973-11-12
JPS59118506A (ja) 1982-12-24 1984-07-09 Sumitomo Rubber Ind Ltd 自動二輪車用タイヤ
EP0113578A2 (fr) 1982-12-24 1984-07-18 Sumitomo Rubber Industries Limited Bandage pneumatique

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0635383A1 (fr) * 1993-07-19 1995-01-25 Bridgestone Corporation Bandage pneumatique
EP0692394A3 (fr) * 1994-07-15 1996-04-03 Michelin Rech Tech Bandage pneumatique à carcasse diagonale comprenant une amélioration dans le renfort de sommet
US5759314A (en) * 1994-07-15 1998-06-02 Michelin Recherche Et Technique S.A. Bias tire having crown reinforcement between carcasses and method of making same
EP1006008A1 (fr) * 1998-11-30 2000-06-07 The Yokohama Rubber Co., Ltd. Bandage pneumatique radial
EP2159076A1 (fr) * 2008-08-29 2010-03-03 The Goodyear Tire & Rubber Company Pneu à plis modulaires avec chevauchement de plis
EP2562007A1 (fr) * 2008-08-29 2013-02-27 The Goodyear Tire & Rubber Company Pneu à plis modulaires avec chevauchement de plis
US11077712B2 (en) 2015-10-30 2021-08-03 Pirelli Tyre S.P.A. Tyre for bicycle wheels
EP3575109A1 (fr) * 2018-05-29 2019-12-04 Specialized Bicycle Components, Inc. Pneu de bicyclette a carcasse a deux couches
WO2022171226A1 (fr) * 2021-02-12 2022-08-18 Continental Reifen Deutschland Gmbh Pneumatique pour deux-roues

Also Published As

Publication number Publication date
EP0484831B1 (fr) 1993-02-03
ES2038527T3 (es) 1993-07-16
DE59100036D1 (de) 1993-03-18

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